Refrigerator



FIG. 1 is a perspective view of a refrigerator showing our new design;

FIG. 2 is a front elevational view of the refrigerator of FIG. 1;

FIG. 3 is a left side elevational view of the refrigerator of FIG. 1, the right side of which is a mirror image thereof; and,

FIG. 4 is a top plan view of the refrigerator of FIG. 1.

The broken lines shown in the drawing disclosure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a refrigerator, as shown and described. 